NEET Biology question
Not in NEET syllabus
Which of the following is/are correct regarding the pressure flow model for translocation? I. Sugar is transported through phloem as glucose II. Movement of sugar is carried out through sieve tube elements near the source region III. Concentration of sugar is always highest near the sink region IV. Water from the adjacent xylem moves into phloem by osmosis
Solution
Sugar is transported in phloem predominantly as sucrose, not glucose, so statement I is false. Statement II is correct — sugar loading and initial movement through sieve tube elements occurs near the source. Statement III is false because sugar concentration is highest near the
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